<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>01概览</title>
    <link href="../../../css/bootstrap.min.css" rel="stylesheet">
    <script src="../../../js/jquery-2.1.1.js"></script>
    <script src="../../../js/bootstrap.js"></script>
    <script>

    </script>
</head>
<body>
        <div class="dropdown">
            <button class="btn btn-default dropdown-toggle " type="button"data-toggle="dropdown">
                下拉菜单
                <span class="caret"></span>
            </button>
            <ul class="dropdown-menu" role="menu">
                <li role="presentation"><a role="menuitem" tabindex="-1"href="#">hello</a></li>
                <li role="presentation"><a role="menuitem" tabindex="-1"href="#">hello</a></li>
                <li role="presentation"><a role="menuitem" tabindex="-1"href="#">hello</a></li>
                <li role="presentation"><a role="menuitem" tabindex="-1"href="#">hello</a></li>
                <li role="presentation"><a role="menuitem" tabindex="-1"href="#">hello</a></li>
                <li role="presentation"><a role="menuitem" tabindex="-1"href="#">hello</a></li>
            </ul>
        </div>

</body>
</html>
